CVE-2024-21620
Junos OS: SRX Series and EX Series: J-Web doesn't sufficiently sanitize input to prevent XSS
An Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in J-Web of Juniper Networks Junos OS on SRX Series and EX Series allows an attacker to construct a URL that when visited by another user enables the attacker to execute commands with the target's permissions, including an administrator.
A specific invocation of the emit_debug_note method in webauth_operation.php will echo back the data it receives.
This issue affects Juniper Networks Junos OS on SRX Series and EX Series:
- All versions earlier than 20.4R3-S10;
- 21.2 versions earlier than 21.2R3-S8;
- 21.4 versions earlier than 21.4R3-S6;
- 22.1 versions earlier than 22.1R3-S5;
- 22.2 versions earlier than 22.2R3-S3;
- 22.3 versions earlier than 22.3R3-S2;
- 22.4 versions earlier than 22.4R3-S1;
- 23.2 versions earlier than 23.2R2;
- 23.4 versions earlier than 23.4R2.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- Required
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
Junos OS: SRX Series and EX Series: J-Web doesn't sufficiently sanitize input to prevent XSS
An Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in J-Web of Juniper Networks Junos OS on SRX Series and EX Series allows an attacker to construct a URL that when visited by another user enables the attacker to execute commands with the target's permissions, including an administrator.
A specific invocation of the emit_debug_note method in webauth_operation.php will echo back the data it receives.
This issue affects Juniper Networks Junos OS on SRX Series and EX Series:
- All versions earlier than 20.4R3-S10;
- 21.2 versions earlier than 21.2R3-S8;
- 21.4 versions earlier than 21.4R3-S6;
- 22.1 versions earlier than 22.1R3-S5;
- 22.2 versions earlier than 22.2R3-S3;
- 22.3 versions earlier than 22.3R3-S2;
- 22.4 versions earlier than 22.4R3-S1;
- 23.2 versions earlier than 23.2R2;
- 23.4 versions earlier than 23.4R2.
- Record
CVE-2024-21620- CVSS 3.1
- 8.8 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H - Weakness
- CWE-79
- Updated
- 2026-11-02
EUVDEUVD-2024-19268
An Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in J-Web of Juniper Networks Junos OS on SRX Series and EX Series allows an attacker to construct a URL that when visited by another user enables the attacker to execute commands with the target's permissions, including an administrator.
A specific invocation of the emit_debug_note method in webauth_operation.php will echo back the data it receives.
This issue affects Juniper Networks Junos OS on SRX Series and EX Series:
- All versions earlier than 20.4R3-S10;
- 21.2 versions earlier than 21.2R3-S8;
- 21.4 versions earlier than 21.4R3-S6;
- 22.1 versions earlier than 22.1R3-S5;
- 22.2 versions earlier than 22.2R3-S3;
- 22.3 versions earlier than 22.3R3-S2;
- 22.4 versions earlier than 22.4R3-S1;
- 23.2 versions earlier than 23.2R2;
- 23.4 versions earlier than 23.4R2.
- Record
EUVD-2024-19268- CVSS 3.1
- 8.8 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-mph2-x4gq-qj7g
An Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')...
An Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in J-Web of Juniper Networks Junos OS on SRX Series and EX Series allows an attacker to construct a URL that when visited by another user enables the attacker to execute commands with the target's permissions, including an administrator.
A specific invocation of the emit_debug_note method in webauth_operation.php will echo back the data it receives.
This issue affects Juniper Networks Junos OS on SRX Series and EX Series:
- All versions earlier than 20.4R3-S10;
- 21.2 versions earlier than 21.2R3-S8;
- 21.4 versions earlier than 21.4R3-S6;
- 22.1 versions earlier than 22.1R3-S5;
- 22.2 versions earlier than 22.2R3-S3;
- 22.3 versions earlier than 22.3R3-S2;
- 22.4 versions earlier than 22.4R3-S1;
- 23.2 versions earlier than 23.2R2;
- 23.4 versions earlier than 23.4R2.
- Record
GHSA-mph2-x4gq-qj7g- CVSS 3.1
- 8.8 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H - Weakness
- CWE-79
- Updated
- 2026-11-02
NVD
An Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in J-Web of Juniper Networks Junos OS on SRX Series and EX Series allows an attacker to construct a URL that when visited by another user enables the attacker to execute commands with the target's permissions, including an administrator.
A specific invocation of the emit_debug_note method in webauth_operation.php will echo back the data it receives.
This issue affects Juniper Networks Junos OS on SRX Series and EX Series:
- All versions earlier than 20.4R3-S10;
- 21.2 versions earlier than 21.2R3-S8;
- 21.4 versions earlier than 21.4R3-S6;
- 22.1 versions earlier than 22.1R3-S5;
- 22.2 versions earlier than 22.2R3-S3;
- 22.3 versions earlier than 22.3R3-S2;
- 22.4 versions earlier than 22.4R3-S1;
- 23.2 versions earlier than 23.2R2;
- 23.4 versions earlier than 23.4R2.
- Record
CVE-2024-21620- CVSS 3.1
- 8.8 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H - CVSS 3.1
- 6.1 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N - Weakness
- CWE-79
- Updated
- 2026-11-02
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2024-21620 is a high vulnerability (CVSS 8.8) in Juniper Junos, published January 25, 2024. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.91%, the 60th percentile. No source names a fixed version.